A
scalloped front is where the lace or skin on a front hair line is cut in a
saw-tooth shape—Zigzags.

It
broke up the straight front hairline and made it slightly more realistic
creating a softer and more natural appearance

We
usually don't make scallop to lace material can already create a very natural
hairline, meanwhile lace scallop will make the lace edge fray more rapidly.
Scallop front usually apply to skin material only.

Here
below is the scallop size options for your reference, you can compare the scale
under the sketches and order a proper scallop size for yourself.